韩国忠清北道生物可利用的锶(Sr)、钕(Nd)和铅(Pb)的同位素分布情况

IF 2.5 4区 化学 Q3 CHEMISTRY, ANALYTICAL
Min-Ji Jung, Youn-Joong Jeong, Woo-Jin Shin, Albert Chang-sik Cheong
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引用次数: 0

摘要

绘制生物可利用同位素比率在地貌中的分布图是一种有效的地球化学工具,可用于划分人类和动物的起源和迁移轨迹。韩国中部的忠清北道以其地质多样性和不受沿海影响的内陆位置而闻名,是研究地质和环境因素对同位素景观(isoscape)影响的理想地区。本研究利用本研究和以往研究获得的植物和土壤数据,分析了忠清北道生物可利用锶、钕和铅同位素的分布情况。忠清北道的地质要素多种多样,包括前寒武纪基底、古生代变质岩、中生代花岗岩和火山沉积岩序列。44 个地点的块状土壤样本的 87Sr/86Sr 比率主要介于 0.781 至 0.706 之间,其中两个比率超过 0.9 的样本分别来自前寒武纪基底和白垩纪花岗岩地区。用 1 M 硝酸铵和醋酸处理过的部分土壤的 87Sr/86Sr 比率无差别(R2 = 0.99,只有一个点除外),范围在 0.804 到 0.707 之间。植物的 87Sr/86Sr 比值与浸出液比值呈稳健的正相关(对于硝酸铵数据,(87Sr/86Sr)植物 = 0.938 × (87Sr/86Sr)浸出液 + 0.045,R2 = 0.98)。来自前寒武纪基底地区的块状土壤的εNd值(-18 至 -30)与 Sm/Nd 比率的关系围绕着与 3 Ga 相对应的参考线,而其它块状土壤样品(εNd = -1 至 -21)则与较年轻(~ 2 Ga)的参考线一致。植物εNd值在-4到-24之间,与硝酸铵浸出液呈显著的正相关(植物εNd = 0.77 × 浸出液εNd - 3.83,R2 = 0.89)。植物样品在 87Sr/86Sr 和 εNd 之间没有显示出一致的变化。块状土壤中的 206Pb/204Pb 和 207Pb/204Pb 比值呈现约 2 Ga 的趋势,是韩国基底岩石的典型特征。硝酸铵和醋酸浸出物的铅同位素比值完全吻合(R2 = 0.99)。植物样本的 206Pb/204Pb、207Pb/204Pb 和 208Pb/204Pb 比值变化范围较窄(19.2-17.9;15.8-15.5;39.0-38.0),与块状土壤(24.4-17.9;16.5-15.6;42.5-37.9)及其浸出液(23.1-17.7;16.2-15.6;41.0-38.1)的比值明显不同。本研究和以往工作中获得的植物和土壤数据被用于构建硒和钕等值分布图,并采用了基于反距离加权、简单克里金法、经验贝叶斯克里金法以及考虑地质和地形的经验贝叶斯克里金法回归预测的插值模型。这些地图有待通过分析更多档案进行验证。本研究获得的同位素数据突出表明,地质对生物可利用的硒和钕有很强的控制作用,而环境对生物可利用的铅的影响则占主导地位。这里展示的硒和钕同位素图对于解决考古或法医调查的现有问题具有潜在价值。尽管如此,通过增加样本密度和改进内插法模型来进一步完善这些地图还是大有裨益的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Isotopic distribution of bioavailable Sr, Nd, and Pb in Chungcheongbuk-do Province, Korea
Mapping the distribution of bioavailable isotope ratios across landscapes serves as an efficient geochemical tool for delineating the origins and migration trajectories of humans and animals. Chungcheongbuk-do Province in central Korea, known for its geological diversity and inland location isolated from coastal influences, provides an ideal area to study the contributions of geological and environmental factors to the isotope landscape (isoscape). This study analyzed the distribution of bioavailable Sr, Nd, and Pb isotopes in the province using plant and soil data obtained in this study and from previous works. Chungcheongbuk-do features diverse geological elements, including Precambrian basement, Paleozoic metasedimentary rocks, and Mesozoic granitoids and volcano-sedimentary sequences. The 87Sr/86Sr ratios of bulk soil samples from 44 sites primarily range from 0.781 to 0.706, with two ratios exceeding 0.9 originating from Precambrian basement and Cretaceous granitoid areas. Fractions of soils treated with 1 M ammonium nitrate and acetic acid exhibit indistinguishable 87Sr/86Sr ratios (R2 = 0.99, except for one point), spanning from 0.804 to 0.707. Plant 87Sr/86Sr ratios demonstrate a robust positive correlation with leachate ratios (for ammonium nitrate data, (87Sr/86Sr)plant = 0.938 × (87Sr/86Sr)leachate + 0.045, R2 = 0.98). The εNd values of bulk soils from Precambrian basement areas (–18 to –30) plot against Sm/Nd ratios around the reference line corresponding to 3 Ga, while other bulk soil samples (εNd = –1 to –21) align with a younger (~ 2 Ga) reference line. Plant εNd values, ranging from –4 to –24, exhibit a prominent positive correlation with ammonium nitrate leachates (plant εNd = 0.77 × leachate εNd – 3.83, R2 = 0.89). Plant samples do not show consistent variation between 87Sr/86Sr and εNd. The 206Pb/204Pb and 207Pb/204Pb ratios of bulk soils show a ~ 2 Ga trend, typical for Korean basement rocks. The Pb isotopic ratios of ammonium nitrate and acetic acid leachates match perfectly with each other (R2 = 0.99). The 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios of plant samples vary narrowly (19.2–17.9; 15.8–15.5; 39.0–38.0) and are distinctly different from those of bulk soils (24.4–17.9; 16.5–15.6; 42.5–37.9) and their leachates (23.1–17.7; 16.2–15.6; 41.0–38.1). Plant and soil data from this study and previous works were used to construct Sr and Nd isoscapes, employing interpolation models based on inverse distance weighting, simple kriging, empirical Bayesian kriging, and geology and topography-considered empirical Bayesian kriging regression prediction. These maps await validation through analysis of additional archives. The isotope data obtained in this study highlight a strong geological control over bioavailable Sr and Nd, in contrast to a dominant environmental influence on bioavailable Pb. The Sr and Nd isoscapes presented here are potentially valuable for addressing archaeological or forensic inquiries in their current state. Nevertheless, the maps would benefit from additional refinement with increased sample density and enhanced interpolation models.
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来源期刊
Journal of Analytical Science and Technology
Journal of Analytical Science and Technology Environmental Science-General Environmental Science
CiteScore
4.00
自引率
4.20%
发文量
39
审稿时长
13 weeks
期刊介绍: The Journal of Analytical Science and Technology (JAST) is a fully open access peer-reviewed scientific journal published under the brand SpringerOpen. JAST was launched by Korea Basic Science Institute in 2010. JAST publishes original research and review articles on all aspects of analytical principles, techniques, methods, procedures, and equipment. JAST’s vision is to be an internationally influential and widely read analytical science journal. Our mission is to inform and stimulate researchers to make significant professional achievements in science. We aim to provide scientists, researchers, and students worldwide with unlimited access to the latest advances of the analytical sciences.
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